Electric Field Lines
The direction of electric field at any point is tangent to the field line passing
through that point and in direction indicated by arrows on the field line.
Lines are close together strong field. Lines are far apart weak field.
Electr

Chapter 21 Electric Current and Direct-Current Circuits
Figure 21-2 The flashlight: A simple electrical circuit
When the switch is closed,
electric charges flow
through the circuit.
Flow of electric charges
is called electric current.
Figure 21-1
Water fl